The importance of preparing your notes for class vary on the type of class. For lectures, your notes might be quite useless in general. This is because you’ll be writing new notes and struggling to listen to the lecturer as they explain the material. Checking your previous notes becomes a hassle and might actually compromise your concentration in class. However, for seminars notes are an essential to prepare beforehand. As seminars are generally practical and require you to complete tasks, having your notes with you will be a huge help because nobody should expect you to have memorised everything that has been taught to you over the progression of your studies. Having your notes on hand will definitely help you complete the tasks in your seminars and avoid a wasteful session of unguided confusion.